Mobile communication method, radio access network device, and mobility management node

Abstract

A handover method according to the present invention includes a step A of transmitting, by MME, “Reloc/HO Req” including “PS/CS HO Indication” to RNC/BSS via MSC, a step B of transmitting, by the MME, “Reloc/HO Req” including the “PS/CS HO Indication” to the RNC/BSS via SGSN, and a step C of transmitting, by the RNC/BSS, “PS to CS Resp” and “Forward Reloc Resp” to the MME after both the “Reloc/HO Req (for a CS bearer)” and the “Reloc/HO Req (for a PS bearer)” are received.

1 . A handover method of a mobile station that performs voice communication and packet communication by using a packet switch bearer via a radio access network device of a first communication scheme not supporting circuit switching communication, comprising:
 a step A of transmitting, by a mobile management node accommodating the radio access network device of the first communication scheme, a resource ensuring signal for a circuit switch bearer for requesting to ensure a resource of a circuit switch bearer used in the voice communication to a radio access network device of a second communication scheme via a circuit switch of the second communication scheme supporting the circuit switching communication, the resource ensuring signal including first instruction information indicating that handover is performed for voice communication and packet communication;   a step B of transmitting, by the mobile management node, a resource ensuring signal for a packet switch bearer for requesting to ensure a resource of a packet switch bearer used in the packet communication to the radio access network device of the second communication scheme via a packet switch of the second communication scheme, the resource ensuring signal including the first instruction information;   a step C of transmitting, by the radio access network device of the second communication scheme, a response signal for the circuit switch bearer indicating that the resource of the circuit switch bearer has been ensured and a response signal for the packet switch bearer indicating that the resource of the packet switch bearer has been ensured to the mobile management node after both the resource ensuring signal for the circuit switch bearer and the resource ensuring signal for the packet switch bearer are received; and   a step D of transmitting, by the mobile management node, a handover instruction signal from the radio access network of the first communication scheme to the radio access network of the second communication scheme for the voice communication and the packet communication to the mobile station via the radio access network device of the first communication scheme when the response signal for the circuit switch bearer and the response signal for the packet switch bearer are received.   
     
     
         2 . The handover method according to  claim 1 , wherein,
 in the step C, when the resource ensuring signal for the packet switch bearer is not received until a predetermined period has elapsed after the resource ensuring signal for the circuit switch bearer including the first instruction information is received, the radio access network device of the second communication scheme transmits the response signal for the circuit switch bearer including second instruction information indicating that handover is performed for only the voice communication, and   in the step D, when the response signal for the circuit switch bearer including the second instruction information is received, the mobile management node transmits the handover instruction signal from the radio access network device of the first communication scheme to the radio access network device of the second communication scheme for only the voice communication.   
     
     
         3 . A handover method of a mobile station that performs voice communication and packet communication by using a packet switch bearer via a radio access network device of a first communication scheme not supporting circuit switching communication, comprising:
 a step A of transmitting, by a mobile management node accommodating the radio access network device of the first communication scheme, a resource ensuring signal for a circuit switch bearer for requesting to ensure a resource of a circuit switch bearer used in the voice communication to a radio access network device of a second communication scheme via a circuit switch of the second communication scheme supporting the circuit switching communication;   a step B of transmitting, by the radio access network device of the second communication scheme, a response signal for the circuit switch bearer including instruction information and indicating that the resource of the circuit switch bearer has been ensured to the mobile management node without waiting for reception of a resource ensuring signal for a packet switch bearer for requesting to ensure a resource of a packet switch bearer used in the packet communication when instruction information indicating that handover is performed for only the voice communication is included in the resource ensuring signal for the circuit switch bearer; and   a step C of transmitting, by the mobile management node, a handover instruction signal from the radio access network device of the first communication scheme to the radio access network device of the second communication scheme for only the voice communication to the mobile station via the radio access network device of the first communication scheme when the response signal for the circuit switch bearer including the instruction information is received.   
     
     
         4 . The handover method according to  claim 3 , wherein, in the step A, even though performing handover for the voice communication and the packet communication is instructed by a handover request signal transmitted by the radio access network device of the first communication scheme, when it is determined that the handover is not performed for the packet communication, the mobile management node transmits the resource ensuring signal for the circuit switch bearer including the instruction information. 
     
     
         5 . A handover method of a mobile station that performs voice communication and packet communication by using a packet switch bearer via a radio access network device of a first communication scheme not supporting circuit switching communication, comprising:
 a step of transmitting, by a mobile management node accommodating the radio access network device of the first communication scheme, a resource ensuring signal for a circuit switch bearer for requesting to ensure a resource of a circuit switch bearer used in voice communication to a radio access network device of a second communication scheme via a circuit switch of the second communication scheme supporting the circuit switching communication, the resource ensuring signal including first instruction information indicating that handover is performed for the voice communication and the packet communication;   a step of transmitting, by the mobile management node, a resource ensuring signal for a packet switch bearer for requesting to ensure a resource of a packet switch bearer used in the packet communication to the radio access network device of the second communication scheme via a packet switch of the second communication scheme, the resource ensuring signal including the first instruction information;   a step of transmitting, by the packet switch of the second communication scheme, a response signal for the packet switch bearer including error response to the mobile management node without transmitting the resource ensuring signal for the packet switch bearer to the radio access network device of the second communication scheme when rejecting establishment of the packet switch bearer used in the packet communication;   a step of performing, by the mobile management node, a cancellation process for ensuring a resource of the circuit switch bearer and the packet switch bearer when the response signal for the packet switch bearer including the error response is received;   a step of transmitting, by the mobile management node, the resource ensuring signal for the circuit switch bearer to the radio access network device of the second communication scheme via the circuit switch of the second communication scheme, the resource ensuring signal including second instruction information indicating that handover is performed for only the voice communication;   a step of transmitting, by the radio access network device of the second communication scheme, a response signal for the circuit switch bearer indicating that the resource of the circuit switch bearer has been ensured to the mobile management node without waiting for reception of the resource ensuring signal for the packet switch bearer when the resource ensuring signal for the circuit switch bearer including the second instruction information is received; and   a step of transmitting, by the mobile management node, a handover instruction signal from the radio access network device of the first communication scheme to the radio access network device of the second communication scheme for only the voice communication to the mobile station via the radio access network device of the first communication scheme when the response signal for the circuit switch bearer including the second instruction information is received.   
     
     
         6 . A handover method of a mobile station that performs voice communication and packet communication by using a packet switch bearer via a radio access network device of a first communication scheme not supporting circuit switching communication, comprising:
 a step of transmitting, by a mobile management node accommodating the radio access network device of the first communication scheme, a resource ensuring signal for a circuit switch bearer for requesting to ensure a resource of a circuit switch bearer used in voice communication to a radio access network device of a second communication scheme via a circuit switch of the second communication scheme supporting the circuit switching communication, the resource ensuring signal including first instruction information indicating that handover is performed for the voice communication and the packet communication;   a step of transmitting, by the mobile management node, a resource ensuring signal for a packet switch bearer for requesting to ensure a resource of a packet switch bearer used in the packet communication to the radio access network device of the second communication scheme via a packet switch of the second communication scheme, the resource ensuring signal including the first instruction information;   a step of performing, by the mobile management node, a cancellation process for ensuring a resource of the circuit switch bearer and the packet switch bearer when a response signal for the packet switch bearer indicating that the resource of the packet switch bearer has been ensured is not received until a predetermined period has elapsed after the resource ensuring signal for the packet switch bearer is transmitted;   a step of transmitting, by the mobile management node, the resource ensuring signal for the circuit switch bearer to the radio access network device of the second communication scheme via the circuit switch of the second communication scheme, the resource ensuring signal including second instruction information indicating that handover is performed for only the voice communication;   a step of transmitting, by the radio access network device of the second communication scheme, a response signal for the circuit switch bearer including the second instruction information and indicating that the resource of the circuit switch bearer has been ensured to the mobile management node without waiting for reception of the resource ensuring signal for the packet switch bearer when the resource ensuring signal for the circuit switch bearer including the second instruction information is received; and   a step of transmitting, by the mobile management node, a handover instruction signal from the radio access network device of the first communication scheme to the radio access network device of the second communication scheme for only the voice communication to the mobile station via the radio access network device of the first communication scheme when the response signal for the circuit switch bearer including the second instruction information is received.   
     
     
         7 . A radio access network device of a second communication scheme, which supports circuit switching communication in a mobile communication system that performs handover of a mobile station performing voice communication and packet communication by using a packet switch bearer via a radio access network device of a first communication scheme not supporting the circuit switching communication, wherein the radio access network device of the second communication scheme
 receives a resource ensuing signal for a circuit switch bearer for requesting to ensure a resource of a circuit switch bearer used in the voice communication from a mobile management node accommodating the radio access network device of the first communication scheme via a circuit switch of the second communication scheme supporting the circuit switching communication,   receives a resource ensuing signal for a packet switch bearer for requesting to ensure a resource of a packet switch bearer used in the packet communication from the mobile management node via the circuit switch of the second communication scheme, and   transmits, to the mobile management node, a response signal for the circuit switch bearer indicating that the resource of the circuit switch bearer has been ensured and a response signal for the packet switch bearer indicating that the resource of the packet switch bearer has been ensured after both the resource ensuing signal for the circuit switch bearer and the resource ensuing signal for the packet switch bearer are received when first instruction information indicating that handover is performed for the voice communication and the packet communication is included in the received response signal for the circuit switch bearer or response signal for the packet switch bearer.   
     
     
         8 . The radio access network device according to  claim 7 , wherein, when the first instruction information is included in the received resource ensuing signal for the circuit switch bearer and the resource ensuing signal for the packet switch bearer is not received until a predetermined period has elapsed after the resource ensuing signal for the circuit switch bearer is received, the radio access network device of the second communication scheme transmits the response signal for the circuit switch bearer including second instruction information indicating that handover is performed for only the voice communication. 
     
     
         9 . A radio access network device of a second communication scheme, which supports circuit switching communication in a mobile communication system that performs handover of a mobile station performing voice communication and packet communication by using a packet switch bearer via a radio access network device of a first communication scheme not supporting the circuit switching communication, wherein the radio access network device of the second communication scheme
 receives a resource ensuing signal for a circuit switch bearer for requesting to ensure a resource of a circuit switch bearer used in the voice communication from a mobile management node accommodating the radio access network device of the first communication scheme via a circuit switch of the second communication scheme supporting the circuit switching communication,   transmits, to the mobile management node, a response signal for the circuit switch bearer including instruction information and indicating that the resource of the circuit switch bearer has been ensured without waiting for reception of a resource ensuing signal for the packet switch bearer for requesting to ensure a resource of the packet switch bearer used in the packet communication when the instruction information indicating that handover is performed for only the voice communication is included in the received resource ensuing signal for the circuit switch bearer.   
     
     
         10 . A mobile management node that accommodates a radio access network device of a communication scheme in a mobile communication system that performs handover of a mobile station performing voice communication and packet communication by using a packet switch bearer via the radio access network device of the communication scheme not supporting circuit switching communication, wherein the mobile management node
 transmits a resource ensuring signal for a circuit switch bearer for requesting to ensure a resource of the circuit switch bearer used in the voice communication when it is determined that handover is not performed for the packet communication even though performing handover for the voice communication and the packet communication is instructed by a handover request signal transmitted by the radio access network device, the resource ensuring signal including instruction information indicating that handover is performed for only the voice communication.   
     
     
         11 . A mobile management node that accommodates a radio access network device of a first communication scheme in a mobile communication system that performs handover of a mobile station performing voice communication and packet communication by using a packet switch bearer via the radio access network device of the first communication scheme not supporting circuit switching communication, wherein the mobile management node
 transmits a resource ensuring signal for a circuit switch bearer for requesting to ensure a resource of a circuit switch bearer used in the voice communication to a radio access network device of a second communication scheme via a circuit switch of the second communication scheme supporting the circuit switching communication, the resource ensuring signal including first instruction information indicating that handover is performed for the voice communication and the packet communication,   transmits a resource ensuring signal for a packet switch bearer for requesting to ensure a resource of a packet switch bearer used in the packet communication to the radio access network device of the second communication scheme via the circuit switch of the second communication scheme, the resource ensuring signal including the first instruction information, and   performs a cancellation process for ensuring a resource of the circuit switch bearer and the packet switch bearer and transmits the resource ensuring signal for the circuit switch bearer to the radio access network device of the second communication scheme via the circuit switch of the second communication scheme when a response signal for the packet switch bearer is received from the packet switch of the second communication scheme, the resource ensuring signal including second instruction information indicating that handover is performed for only the voice communication, the response signal including error response and indicating that the resource of the packet switch bearer has been ensured.   
     
     
         12 . A mobile management node that accommodates a radio access network device of a first communication scheme in a mobile communication system that performs handover of a mobile station performing voice communication and packet communication by using a packet switch bearer via the radio access network device of the first communication scheme not supporting circuit switching communication, wherein the mobile management node
 transmits a resource ensuring signal for a circuit switch bearer for requesting to ensure a resource of a circuit switch bearer used in the voice communication to a radio access network device of a second communication scheme via a circuit switch of the second communication scheme supporting the circuit switching communication, the resource ensuring signal including first instruction information indicating that handover is performed for the voice communication and the packet communication,   transmits a resource ensuring signal for a packet switch bearer for requesting to ensure a resource of a packet switch bearer used in the packet communication to the radio access network device of the second communication scheme via the packet switch of the second communication scheme, the resource ensuring signal including the first instruction information, and   performs a cancellation process for ensuring a resource of the circuit switch bearer and the packet switch bearer and transmits the resource ensuring signal for the circuit switch bearer to the radio access network device of the second communication scheme via the circuit switch of the second communication scheme when a response signal for the packet switch bearer is not received until a predetermined period has elapsed after the resource ensuring signal for the packet switch bearer is transmitted, the resource ensuring signal including second instruction information indicating that handover is performed for only the voice communication, the response signal indicating that the resource of the packet switch bearer has been ensured.   
     
     
         13 . A packet switch, which accommodates a radio access network device of a communication scheme in a mobile communication system that performs handover of a mobile station performing voice communication and packet communication by using a packet switch bearer via the radio access network device of the communication scheme supporting circuit switching communication, wherein the mobile management node
 transmits a resource ensuring signal for a circuit switch bearer for requesting to ensure a resource of the circuit switch bearer used in the voice communication when it is determined that handover is not performed for the packet communication even though performing handover for the voice communication and the packet communication is instructed by a handover request signal transmitted by the radio access network device, the resource ensuring signal including instruction information indicating that handover is performed for only the voice communication.